diff --git a/Documentation/devicetree/bindings/net/dwmac-sun8i.txt b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
index 74b3ef79e57a..fe4a48a1eb50 100644
--- a/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
+++ b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
@@ -7,6 +7,7 @@ Required properties:
 - compatible: must be one of the following string:
 		"allwinner,sun8i-a83t-emac"
 		"allwinner,sun8i-h3-emac"
+		"allwinner,sun8i-r40-gmac"
 		"allwinner,sun8i-v3s-emac"
 		"allwinner,sun50i-a64-emac"
 - reg: address and length of the register for the device.
@@ -24,14 +25,17 @@ Required properties:
  compatible string:
   - allwinner,sun8i-a83t-system-controller
   - allwinner,sun8i-h3-system-controller
+  - allwinner,sun8i-r40-ccu
   - allwinner,sun8i-v3s-system-controller
   - allwinner,sun50i-a64-system-controller
 
 Optional properties:
 - allwinner,tx-delay-ps: TX clock delay chain value in ps.
 			 Range is 0-700. Default is 0.
+			 Unavailable for allwinner,sun8i-r40-gmac
 - allwinner,rx-delay-ps: RX clock delay chain value in ps.
 			 Range is 0-3100. Default is 0.
+			 Range is 0-700 for allwinner,sun8i-r40-gmac
 Both delay properties need to be a multiple of 100. They control the
 clock delay for external RGMII PHY. They are do apply to the internal
 PHY or external non-RGMII PHYs.
